Re: [malware-list] [RFC 0/5] [TALPA] Intro to a linuxinterfaceforon access scanning

tvrtko.ursulin
2008-08-13T14:16:38Z

Arjan van de Ven <arjan@infradead.org> wrote on 13/08/2008 14:54:01:

> > I am not sure what you are suggesting, and I may have missed the
> > libmalware proposal (I don't see any mention of that specific idea in
> > any other message). However, just to be clear... At no point did we
> > suggest that the kernel would do any scanning. What we have been
> > interested in is a mechanism that can allow a scanning application to
> > be notified by the kernel of specific i/o events, for those events to
> > be blocked by the kernel until a user-space scan is done, and then the
> > user-space scan sends back allow or deny, at which point the i/o event
> > returns to the caller -- either success or error. This is the only
> > way that malware can be guaranteed of being detected when it is used
> > (for local application purposes or for transmission to another
> > platform) or created.
>
> this is a very broad statement that ignores the LD_PRELOAD approach,
> and thus not true.

LD_PRELOAD does not solve at least knfsd and suid binaries. But we are
going in circles. :)

> > Also, a solution that requires applications to be modified will not
> > work, because there is no way that we would be able to get ALL
> > applications on the machines to be modified in the required ways. If
> > ANY applications are not so modified, then you have an unacceptable
>
> you don't need to modify applications to make them use a library...

Same is true for a kernel solution. Plus, it also works for those who make
system calls directly, knfsd and suid binaries, and we can have cheap and
ultra-efficient caching. Not much kernel code, even less complex kernel
code and unmeasurable impact when not used and compiled in. What are the
big technical objections to that?

--
Tvrtko A. Ursulin
Senior Software Engineer, Sophos

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